Why ......... with the best power main jet fitted. On straight Methanol this thing would run on after a full throttle 10,000 RPM dyno pull. With the petrol meth combination it still runs on after a big dyno pull.
I would expect that enriching it up would be the cure but interestingly the richer I made the methanol main jet the worse the running on became. Why?????.......![]()
Two thoughts, one the Methanol float chamber runs low during a pull (4,3 Delorto Methanol float seat) or there is so much combustion-able fuel being blown through into the pipe mixing with air drawn back through the stinger that its feeding the engine through the exhaust port. Could that be possible? I know that at closed throttle the average pressure in the crank case and exhaust chamber are near atmospheric. So atmospheric air does flow back into the system through the stinger.
When I can I will ask someone to observe the fuel level during a pull to see what happens. Any other suggestions of what to look for would be very welcome.
Bookmarks